CredentialEvaluationContext Runtime context that MSAL hands to an implementation once per token request, after MSAL has evaluated the credentials that will be used for the request. The operation reads the properties it needs and prepares to format the result.

 MsalCacheValidationData Data used to validate cache items for different authentication schemes.

 IAuthenticationOperation Used to modify the experience depending on the type of token asked.

 IAuthenticationOperation2 This is an extensibility API and should only be used by SDKs. Enhanced version of IAuthenticationOperation that supports asynchronous token formatting. Used to modify the experience depending on the type of token asked with async capabilities.

 IAuthenticationOperation3 Extends with a lifecycle hook so MSAL can pass runtime context (e.g., the mTLS certificate selected for the current request) to a custom authentication operation. Enables composition of schemes such as CDT + mTLS PoP without MSAL having to replace the operation.